Fix De Bruijn "No catch for tag" error

When using avy-goto-line and typing a line number with avy-style
de-bruijn, you would get an error after entering your line number and
pressing RET:

    No catch for tag: done, exit

I believe this is because avy-read is wrapped with (catch 'done ...) but
avy-read-de-bruijn doesn't catch done.  This adds the catch to
avy-read-de-bruijn.

avy.el

@@ -390,6 +390,7 @@ multiple DISPLAY-FN invokations."
   ;; possible that the path-len must be incremented, e.g., if we're matching
   ;; for x and a buffer contains xaxbxcx only every second subsequence is
   ;; usable for the four matches.
+  (catch 'done
     (let* ((path-len (ceiling (log (length lst) (length keys))))
            (alist (avy--path-alist-1 lst path-len keys)))
       (while (not alist)
@@ -414,7 +415,7 @@ multiple DISPLAY-FN invokations."
             (cl-incf i)
             (unless alist
               (funcall avy-handler-function char))))
-      (cdar alist))))
+        (cdar alist)))))
 
 ;;** Rest
 (defun avy-window-list ()